MAINT: Style check *.c and *.h files

[gfyoung]

cpplint was introduced #14740, and this commit extends to check other *.c and *.h files.

Currently, they all reside in pandas/src, and this commit expands the lint to check all of the following:

1. datetime (dir)
2. ujson (dir)
3. period_helper.c
4. All header files

The parser directory was handled in #14740, and the others have been deliberately omitted per the discussion here.

[codecov-io]

Current coverage is 85.28% (diff: 100%)

Merging #14814 into master will not change coverage

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  Hits          43466      43466          
  Misses         7502       7502          
  Partials          0          0          

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[gfyoung]

@jreback : Any comments on this? Should be ready to merge.

[jreback]

lgtm.

[jreback]

@jorisvandenbossche I think u included the other style in 0.19.2, so can do this as well (up 2 you)

[jorisvandenbossche]

I didn't include the first style PR for 0.19.2, so for now will do the same for this one. I don't foresee many PRs anymore for 0.19.2, so shouldn't give too much problem

[jreback]

thanks!

[jreback]

any way you can not have the Done processing things show up?
we are explicity set to only errors (and which sub-dir) we are handling show up, otherwise its too much text.

linting -> pandas/src/*.h
Done processing pandas/src/numpy_helper.h
Done processing pandas/src/parse_helper.h
Done processing pandas/src/datetime_helper.h
Done processing pandas/src/helper.h
Done processing pandas/src/skiplist.h
Done processing pandas/src/period_helper.h
linting -> pandas/src/period_helper.c
Done processing pandas/src/period_helper.c
linting -> pandas/src/datetime
Done processing pandas/src/datetime/np_datetime_strings.c
Done processing pandas/src/datetime/np_datetime_strings.h
Done processing pandas/src/datetime/np_datetime.h
Done processing pandas/src/datetime/np_datetime.c
linting -> pandas/src/parser
Done processing pandas/src/parser/tokenizer.h
Done processing pandas/src/parser/io.h
Done processing pandas/src/parser/tokenizer.c
Done processing pandas/src/parser/io.c
linting -> pandas/src/ujson
Done processing pandas/src/ujson/python/ujson.c
Done processing pandas/src/ujson/python/JSONtoObj.c
Done processing pandas/src/ujson/python/objToJSON.c
Done processing pandas/src/ujson/lib/ultrajson.h
Done processing pandas/src/ujson/python/version.h
Done processing pandas/src/ujson/lib/ultrajsondec.c

[gfyoung]

@jreback : Yes, see #14924.